DL 473 then DL 2305 at Boston
Seattle → Boston → Dallas-Fort Worth
Timetable, Boston time
07:20DL 473 from Seattle at the gate
19:30DL 2305 to Dallas-Fort Worth leaves the gate
12 h 10 apart on the timetable
DL 2305 leaves 12 h 10 after DL 473 arrives on the timetable: more than half a day, so not a connection we count.